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Tutorial dekho queries
- 2. Agenda • Introduction to Dekho queries • Query types and how to use them • Spatially enabled queries • Best practices and considerations
- 3. Complete the picture… with queries..
- 4. Dekho queries • Pull information from data sources – Internal / External – Database / Web service / Map service • Defined in Dekho Studio • Executed in runtime by end user • Require some SQL skills • Reusable between applications
- 5. Query sources • JDBC connection • Esri ArcGIS Server Map Service (GDB Only) • Web Service
- 6. Query types • Searching – Search 1 – Combo + Type-Ahead • Result viewing – Layer Information Query 2 – Feature Info Query 3 • Others – Call out – Integration
- 8. Defining a Search Query • Always executed against a feature class in the GDB • Returning a single spatial feature set (ObjectID) • User interaction – data entry fields (optional) Select * from [Feature Class] Where [User data entry] Select * from properties Where street_name like %Manningtree%
- 9. User data entry fields • Go into the “Where clause” of the search SQL statement • Text / Date / List / Drop Down
- 10. Type-ahead Combo-box
- 11. Combo and Type-ahead • Structure user data entry in search queries • ANY database (not just the GDB) • Lists Of Values (LOV): – Value = What you display ID Value – ID = What you use Vic Victoria • Ordered (? Your call…) NSW New South Wales Tas Tasmania WA West Australia SA South Australia NT Northern Territory
- 12. Reusing Combo and Type-ahead • Define once and reuse Search #1 Search #2 Search #3 Combo-Box Query
- 14. Working with search results • Working with a complete picture • Connecting with non-spatial data ObjectID sources ObjectID ObjectID ObjectID ObjectID • Getting the information you need ObjectIDObjectID ObjectID
- 15. LIQ’s and FIQ’s Layer Information Specific feature Information
- 16. Getting the information you need Current GDB Selected Feature Asset ID Asset Mgmt The information System I wish to display
- 17. Getting the information you need Foreign Asset Id KEY ObjectID AssetID ObjectID GDB Asset ID AID Asset Mgmt System AssetID
- 18. GDB link to 3rd party systems
- 19. Getting the information you need ObjectID AssetID AID X Y Z What Dekho does: 1. Get AssetId by ObjectID (GDB) 2. Find row in AMS table based on AssetID 3. Select relevant fields (X,Y,Z)
- 20. Getting the data you need Asset ID ObjectID+AssetID Mapping relationship SELECTION.AssetID = AMS.AssetID Asset Mgmt GDB System
- 21. LIQ’s and FIQ’s Multiple queries span across multiple tabs
- 22. Example: reviewing a property FIQ1 FIQ3 FIQ2 Owners history list Lot # information Related approvals
- 23. Queries and maps
- 24. Query types • Searching – Search – Combo + Typeahead • Result viewing – Layer Information Query – Feature Info Query • Others – Call out – Integration
- 25. Callout Query • Any data source • Select relevant fields
- 26. Dekho Integration Query • SQL query that translates one set of values (OBJECTID) to another (ASSETID)
- 29. Query types • Searching – Search – Combo + Typeahead • Result viewing – Layer Information Query – Feature Info Query • Others – Call out – Integration
- 30. Spatial selection I want users to search a heritage site and see properties that intersect with the selected heritage site
- 31. Spatial selection Spatial query Property lot layer Heritage site layer Search query
- 32. Queries points for consideration
- 33. Remember!! • Spatial query is optional – Search query – Feature Info query • Results are from the TARGET layer
- 34. Queries points for consideration • Renaming DB fields names to logical names select Field_Name1 as “User Friendly Name1” • Complete the picture vs. Information overload – Avoid select * statements – Use multiple FIQ’s and LIQ’s – Map to end user workflow • Query performance optimization
- 35. Complete the picture… with queries..